These were the other filters that GM4LIFE sent me to open up. Right off the bat there is a difference in OAL. PF48 is on the right in all side by side pictures. And once again thank GM4LIFE for supplying these filters for cutting. Enjoy the pictures! Both OAL's were checked with gasket in place. PF48E--->3.170 PF48---->3.450 OD's were same on both. Construction wise both were identical as the larger PF63E & PF63 I cut open earlier this week. Nicely constructed just like the others. And after opening them up as you'll see in the pictures below the filter media on both filters is about the same length. I added the XG3614 I run in my 4runner just fore size comparison purposes only.